514 On the Ihjmenopierous Genera Myzlne and Plesia. 



sparse fringe of pale fulvous hairs on the basal half of the 

 outer margin. Pronotum a little broader than the head, 

 nearly three times as broad as long, rather sparsely punctured. 

 Mesonotum and scutellum very sparsely punctured, the meso- 

 notum with two longitudinal sulci on each side, the inner 

 sulci slightly more convergent posteriorly than the outer. 

 Mesopleurse strongly, but not very closely punctured ; the 

 scutellum not quite as long as the mesonotum. Median 

 segment finely rugose, punctured at the base, the sides of 

 the segment finely striated ; shorter than the mesonotum, 

 steeply sloped posteriorly, the posterior surface finely obliquely 

 striated and covered with short cinereous pubescence. Abdo- 

 men sparsely and rather finely punctured, the segments 

 smooth at the base, the second and third segments with a 

 slightly raised transverse line near the base ; the first seg- 

 ment truncate at ihe base, the dorsal surface not more than 

 half as long as the second segment. Epipyglum longi- 

 tudinally striated, rounded at the apex ; the hypopygiurn 

 projecting beyond the epipygium and narrowly truncate at 

 the apex. I'he intermediate and posterior tibite very broad, 

 flattened on the outer surface and very coarsely rugose, the 

 margins closely serrated. The basal joint of the posterior 

 tarsi is more than twice as long as the second joint, armed 

 with two or three spines before the apex and with a comb of 

 short, closely-set spines beneath. The first joint of the 

 anterior tarsi is strongly emarginate at the base beneath. 

 Black; ihe mandibles, a spot at the apex of the scape, a spot 

 on the tegulae, the apical joints of the tarsi and the apex of 

 the pygidium dark fusco-ferruginous, the spines of the tibiaj 

 whitish. Wings deep fulvo-hyaline, the apical third fusco- 

 hyaline, dark fuscous in the third cubital cell and beyond the 

 apex of the radial cell ; nervures ferruginous. The first 

 recurrent nervure is received by the second cubital cell at one- 

 third from the apex, the second just before the middle of the 

 third cubital cell. The second cubital cell is as long as the 

 third on the radial nervure and nearly twice as long on the 

 cubital nervure as on the radial. The third cubital cell is 

 more than half as long again on the cubital as on the radial 

 nervure and half as broad again at the apex as at the 

 base. cJ unknown. 



Length 14-17 mm. 



Jlab. Mendoza, Argentina (December-March). 



Described from three specimens purchased from H. Rolle. 



